<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>javascript</title>
  <style>
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box
    }
    body {
      font-size: 14px;
      padding: 20px;
    }
    ul li {
      line-height: 30px;
    }
  </style>
</head>
<body>
  <ul>
    <li></li>
  </ul>
</body>
<script>
    let obj = {
        name: 'hello world' 
    }
    function Fn(){}
    Fn.prototype.title = 'hellow'
    Fn.prototype.getName = function() {
        return this.title
    }
    var fn = new Fn()
    console.dir(fn)
    console.log(fn.__proto__) // hello world
</script>
</html>